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Clinical course of ICU patients with severe pandemic 2009 influenza A (H1N1) pneumonia: single center experience with proning and pressure release ventilation

Krishna M Sundar, Phillip Thaut, David B Nielsen, William T Alward, Michael J Pearce
Journal of Intensive Care Medicine 2012, 27 (3): 184-90

BACKGROUND: A number of different modalities have been employed in addition to conventional ventilation to improve oxygenation in patients with severe 2009 pandemic influenza A (H1N1) pneumonia. Outcomes with ventilatory and rescue therapies for H1N1 influenza-related acute respiratory distress syndrome (ARDS) have been varied. A single intensive care unit (ICU) experience with management of laboratory-confirmed 2009 pandemic influenza A (H1N1) ARDS with a combination of proning and airway pressure release ventilation (APRV) is described.

METHODS: A retrospective review of medical records of ICU patients seen at Utah Valley Regional Medical Center during the first and second waves of the H1N1 influenza pandemic was done.

RESULTS: Fourteen ICU patients were managed with invasive ventilation for 2009 pandemic influenza A (H1N1)-related ARDS. Hypoxemia refractory to conventional ventilation was noted in 11 of 14 patients despite application of APRV. Following proning in patients on APRV, improvement of hypoxemia and hemodynamic status was achieved. Only 2 of 11 patients on APRV and proning required continuous dialysis. Mortality in intubated patients receiving a combination of proning and APRV was 27.3% (3/11) with 2 of these dying during the first wave of the H1N1 influenza pandemic. In all, 3 of 11 patients on proning and APRV underwent tracheostomy, with 2 of these undergoing tube thoracostomy. ARDSnet fluid-conservative protocol was safely tolerated in 8 of 11 of the intubated patients following initiation of proning and APRV.

CONCLUSIONS: Proning in combination with APRV provides improvement of hypoxemia with limitation of end-organ dysfunction and thereby facilitates recovery from severe 2009 pandemic influenza A (H1N1).


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